The origins of the sash window are not easy to fathom. There are a variety of theories but no absolute proof for any of them. In the late 1600’s, an English inventor, Robert Hooke used them in Ham House and a painting by Vermeer called ‘The Milkmaid’ shows a sash frame behind the girl. It is believed that they might have come from France, via Holland to Britain around this time but the British certainly made them their own.

Windows with double rows of glass panes that opened by sliding to one side or upwards, were initially known as ‘Yorkshire light’. As the windows became larger and heavier, a rope and sash weight system was developed with the rope connected to the window and a pulley running inside the sealed box frame.

In the late 1600’s, the famous architect Sir Christopher Wrens used these windows for Whitehall Palace. They were also used for Kensington and Hampton Court Palace. Wrens’ reputation and the royal patronage gave wooden sash windows a cachet that soon saw them used right across the British empire. Until the early 1900’s, the windows were used almost exclusively in all new constructions both private and public. Whether open or closed they do not detract from the aesthetics of a building unlike other windows.

The double hung sash window which can be opened at the top and bottom were a feature designed during the Georgian era. European weather can range from very wet and cold to very hot during summers. An opening at the top lets hot air escape, while opening the bottom draws in cool air and prevents rain from getting in.

The Victorians had a tendency to the baroque, overloading their houses with extra details, carvings, mouldings and lattice work. The windows were grouped in a bay surrounded by decorative pillars. The perspective of buildings was enhanced by making windows on the downstairs floor taller than those on the top floors.

The sash window was doomed with the advent of the 20th Century. The rapid industrialisation of production processes caused by the demand for machinery and weapons in the First World War, put an end to expensive hand-crafted methods involving much time and labour.

Many older European buildings and cities would be characterless without these beautiful windows, which remain popular even though they cause problems.

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